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maximilian attems

2011-Feb-16 23:06 UTC

[klibc] fwd: fix up ARM assembly to use 'bx lr' in place of 'mov pc, lr'.

hello vorlon,

got notified of your patch,
will apply next days upstream unless some critiques are voiced on ml.
thanks.

-- 
maks


----- Forwarded message from Steve Langasek <steve.langasek at
canonical.com> -----

Date: Wed, 16 Feb 2011 22:05:42 -0000
From: Steve Langasek <steve.langasek at canonical.com>
Subject: [Bug 527720] Re: thumb2 porting issues identified: klibc uses mov.*pc


I've also touched it up to be mergeable with Debian (support v4t builds
with #ifdef).

Confirmed that installing the resulting klibc packages on my beagleboard
gives me a successfully-booting initramfs with klibc; and the
vfork/setjmptest test cases all pass in the klibc package tree.

Fixes: https://bugs.launchpad.net/ubuntu/+source/klibc/+bug/527720

--- klibc-1.5.20.orig/usr/klibc/arch/arm/vfork.S
+++ klibc-1.5.20/usr/klibc/arch/arm/vfork.S
@@ -25,7 +25,11 @@ vfork:
         ldrcs	r3, 1f
         mvncs	r0, #0
         strcs	r2, [r3]
+#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
 	mov	pc, lr
+#else
+	bx	lr
+#endif
 
 	.balign 4
 1:
@@ -49,7 +53,11 @@ vfork:
 	str	r2, [r1]
 	neg	r0, r0
 1:
+#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
 	mov	pc, lr
+#else
+	bx	lr
+#endif
 
 	.balign	4
 2:
--- klibc-1.5.20.orig/usr/klibc/arch/arm/setjmp.S
+++ klibc-1.5.20/usr/klibc/arch/arm/setjmp.S
@@ -29,7 +29,11 @@
 setjmp:
 	stmia	r0, {r4, r5, r6, r7, r8, r9, r10, fp, sp, lr}
 	mov	r0, #0
+#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
 	mov	pc, lr
+#else
+	bx	lr
+#endif
 	.size setjmp,.-setjmp
 
 	.text
@@ -39,7 +43,11 @@ setjmp:
 longjmp:
 	ldmia	r0, {r4, r5, r6, r7, r8, r9, r10, fp, sp, lr}
 	mov	r0, r1
+#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
 	mov	pc, lr
+#else
+	bx	lr
+#endif
 	.size longjmp,.-longjmp
 
 #else /* __thumb__ */
@@ -75,7 +83,11 @@ setjmp:
 	mov	r7, sp
 	stmia	r0!, {r3, r4, r5, r6, r7}
 	mov	r0, #0
+#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
 	mov	pc, lr
+#else
+	bx	lr
+#endif
 	.size setjmp,.-setjmp
 
 	.text
@@ -96,7 +108,11 @@ longjmp:
 	mov	r0, r1
 	bne	1f
 	mov	r0, #1
+#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
 1:	mov	pc, r3
+#else
+1:	bx	r3
+#endif
 	.size longjmp,.-longjmp
 
 #endif /* __thumb__ */

Kirill A. Shutemov

2011-Feb-16 23:50 UTC

head link

[klibc] fwd: fix up ARM assembly to use 'bx lr' in place of 'mov pc, lr'.

On Thu, Feb 17, 2011 at 12:06:48AM +0100, maximilian attems
wrote:> hello vorlon,
> 
> got notified of your patch,
> will apply next days upstream unless some critiques are voiced on ml.
> thanks.
> 
> -- 
> maks
> 
> 
> ----- Forwarded message from Steve Langasek <steve.langasek at
canonical.com> -----
> 
> Date: Wed, 16 Feb 2011 22:05:42 -0000
> From: Steve Langasek <steve.langasek at canonical.com>
> Subject: [Bug 527720] Re: thumb2 porting issues identified: klibc uses
mov.*pc
> 
> 
> I've also touched it up to be mergeable with Debian (support v4t builds
> with #ifdef).
> 
> Confirmed that installing the resulting klibc packages on my beagleboard
> gives me a successfully-booting initramfs with klibc; and the
> vfork/setjmptest test cases all pass in the klibc package tree.
> 
> Fixes: https://bugs.launchpad.net/ubuntu/+source/klibc/+bug/527720
> 
> --- klibc-1.5.20.orig/usr/klibc/arch/arm/vfork.S
> +++ klibc-1.5.20/usr/klibc/arch/arm/vfork.S
> @@ -25,7 +25,11 @@ vfork:
>          ldrcs	r3, 1f
>          mvncs	r0, #0
>          strcs	r2, [r3]
> +#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
NAK. ARMv4T supports bx intruction. ARMv4 doesn't.
>  	mov	pc, lr
> +#else
> +	bx	lr
> +#endif
>  
>  	.balign 4
>  1:
> @@ -49,7 +53,11 @@ vfork:
>  	str	r2, [r1]
>  	neg	r0, r0
>  1:
> +#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
>  	mov	pc, lr
> +#else
> +	bx	lr
> +#endif
>  
>  	.balign	4
>  2:
> --- klibc-1.5.20.orig/usr/klibc/arch/arm/setjmp.S
> +++ klibc-1.5.20/usr/klibc/arch/arm/setjmp.S
> @@ -29,7 +29,11 @@
>  setjmp:
>  	stmia	r0, {r4, r5, r6, r7, r8, r9, r10, fp, sp, lr}
>  	mov	r0, #0
> +#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
>  	mov	pc, lr
> +#else
> +	bx	lr
> +#endif
>  	.size setjmp,.-setjmp
>  
>  	.text
> @@ -39,7 +43,11 @@ setjmp:
>  longjmp:
>  	ldmia	r0, {r4, r5, r6, r7, r8, r9, r10, fp, sp, lr}
>  	mov	r0, r1
> +#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
>  	mov	pc, lr
> +#else
> +	bx	lr
> +#endif
>  	.size longjmp,.-longjmp
>  
>  #else /* __thumb__ */
> @@ -75,7 +83,11 @@ setjmp:
>  	mov	r7, sp
>  	stmia	r0!, {r3, r4, r5, r6, r7}
>  	mov	r0, #0
> +#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
>  	mov	pc, lr
> +#else
> +	bx	lr
> +#endif
>  	.size setjmp,.-setjmp
>  
>  	.text
> @@ -96,7 +108,11 @@ longjmp:
>  	mov	r0, r1
>  	bne	1f
>  	mov	r0, #1
> +#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
>  1:	mov	pc, r3
> +#else
> +1:	bx	r3
> +#endif
>  	.size longjmp,.-longjmp
>  
>  #endif /* __thumb__ */
> 
> _______________________________________________
> klibc mailing list
> klibc at zytor.com
> http://www.zytor.com/mailman/listinfo/klibc
-- 
 Kirill A. Shutemov

Khem Raj

2011-Feb-17 00:03 UTC

head link

[klibc] fwd: fix up ARM assembly to use 'bx lr' in place of 'mov pc, lr'.

On Wed, Feb 16, 2011 at 3:50 PM, Kirill A. Shutemov
<kirill at shutemov.name> wrote:> On Thu, Feb 17, 2011 at 12:06:48AM +0100, maximilian attems wrote:
>> hello vorlon,
>>
>> got notified of your patch,
>> will apply next days upstream unless some critiques are voiced on ml.
>> thanks.
>>
>> --
>> maks
>>
>>
>> ----- Forwarded message from Steve Langasek <steve.langasek at
canonical.com> -----
>>
>> Date: Wed, 16 Feb 2011 22:05:42 -0000
>> From: Steve Langasek <steve.langasek at canonical.com>
>> Subject: [Bug 527720] Re: thumb2 porting issues identified: klibc uses
mov.*pc
>>
>>
>> I've also touched it up to be mergeable with Debian (support v4t
builds
>> with #ifdef).
>>
>> Confirmed that installing the resulting klibc packages on my
beagleboard
>> gives me a successfully-booting initramfs with klibc; and the
>> vfork/setjmptest test cases all pass in the klibc package tree.
>>
>> Fixes: https://bugs.launchpad.net/ubuntu/+source/klibc/+bug/527720
>>
>> --- klibc-1.5.20.orig/usr/klibc/arch/arm/vfork.S
>> +++ klibc-1.5.20/usr/klibc/arch/arm/vfork.S
>> @@ -25,7 +25,11 @@ vfork:
>> ? ? ? ? ?ldrcs ? ? ? ?r3, 1f
>> ? ? ? ? ?mvncs ? ? ? ?r0, #0
>> ? ? ? ? ?strcs ? ? ? ?r2, [r3]
>> +#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
>
> NAK. ARMv4T supports bx intruction. ARMv4 doesn't.
Does ARMv4t support BX lr ?

>
>> ? ? ? mov ? ? pc, lr
>> +#else
>> + ? ? bx ? ? ?lr
>> +#endif
>>
>> ? ? ? .balign 4
>> ?1:
>> @@ -49,7 +53,11 @@ vfork:
>> ? ? ? str ? ? r2, [r1]
>> ? ? ? neg ? ? r0, r0
>> ?1:
>> +#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
>> ? ? ? mov ? ? pc, lr
>> +#else
>> + ? ? bx ? ? ?lr
>> +#endif
>>
>> ? ? ? .balign 4
>> ?2:
>> --- klibc-1.5.20.orig/usr/klibc/arch/arm/setjmp.S
>> +++ klibc-1.5.20/usr/klibc/arch/arm/setjmp.S
>> @@ -29,7 +29,11 @@
>> ?setjmp:
>> ? ? ? stmia ? r0, {r4, r5, r6, r7, r8, r9, r10, fp, sp, lr}
>> ? ? ? mov ? ? r0, #0
>> +#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
>> ? ? ? mov ? ? pc, lr
>> +#else
>> + ? ? bx ? ? ?lr
>> +#endif
>> ? ? ? .size setjmp,.-setjmp
>>
>> ? ? ? .text
>> @@ -39,7 +43,11 @@ setjmp:
>> ?longjmp:
>> ? ? ? ldmia ? r0, {r4, r5, r6, r7, r8, r9, r10, fp, sp, lr}
>> ? ? ? mov ? ? r0, r1
>> +#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
>> ? ? ? mov ? ? pc, lr
>> +#else
>> + ? ? bx ? ? ?lr
>> +#endif
>> ? ? ? .size longjmp,.-longjmp
>>
>> ?#else /* __thumb__ */
>> @@ -75,7 +83,11 @@ setjmp:
>> ? ? ? mov ? ? r7, sp
>> ? ? ? stmia ? r0!, {r3, r4, r5, r6, r7}
>> ? ? ? mov ? ? r0, #0
>> +#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
>> ? ? ? mov ? ? pc, lr
>> +#else
>> + ? ? bx ? ? ?lr
>> +#endif
>> ? ? ? .size setjmp,.-setjmp
>>
>> ? ? ? .text
>> @@ -96,7 +108,11 @@ longjmp:
>> ? ? ? mov ? ? r0, r1
>> ? ? ? bne ? ? 1f
>> ? ? ? mov ? ? r0, #1
>> +#if defined (___ARM_ARCH_4T__) || defined (__ARM_ARCH_4__)
>> ?1: ? mov ? ? pc, r3
>> +#else
>> +1: ? bx ? ? ?r3
>> +#endif
>> ? ? ? .size longjmp,.-longjmp
>>
>> ?#endif /* __thumb__ */
>>
>> _______________________________________________
>> klibc mailing list
>> klibc at zytor.com
>> http://www.zytor.com/mailman/listinfo/klibc
>
> --
> ?Kirill A. Shutemov
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>

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